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Solar panel and magnifying glass.
If you double the sunlight hitting the cell this is called two suns.
High heat is not friendly to most building materials ultimately including solar panels although they are designed to function well north of three digits fahrenheit.
Magnifying glasses increase heat intensity in a focused area but the photovoltaic process that makes solar marvelous is based on light not temperature.
And 3s is triple the sunlight.
Magnifying glasses magnify the intensity of heat in a focused area but in order to be of beneficial use in solar panels there must be a mechanism to disperse the heat and cool down the system.
Yes that would work to double or triple the light hitting the cell by using either magnifying lenses or reflective mirrors.
The problem is when solar cells get hot they become less efficient.